CHAPTER28 Configuring Supplementary Services
Mediant 1000 Gateway & E-SBC | User's Manual
Typically, the MF spills are sent from the E911 tandem switch to the PSAP, as shown in the table
below:
Table 28-1: Dialed MF Digits Sent to PSAP
Digits of Calling Number Dialed MF Digits
8 digits "nnnnnnnn" (ANI) "KPnnnnnnnnST"
12 digits "nnnnnnnnnnnn" (ANI) "KPnnnnnnnnnnnnSTP"
12 digits ANI and 10 digits PANI "KPnnnnnnnnnnnnSTKPmmmmmmmmmmST"
two digits "nn" "KPnnSTP"
The MF KP, ST, and STP digits are mapped as follows:
â– * for KP
â– # for ST
â– B for STP
For example, if ANI and PANI are received, the SIP INVITE contains the following From header:
From: <sip:*nnnnnnnnnnnn#*mmmmmmmmmm#@10.2.3.4>;tag=1c14
It is possible to remove the * and # characters, using the device's number manipulation
rules.
If the device receives the SIP INFO message below, it then generates a "hookflash" mid-call Wink
signal:
INFO sip:4505656002@192.168.13.40:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.13.2:5060
From: port1vega1 <sip:06@192.168.13.2:5060>
To: <sip:4505656002@192.168.13.40:5060>;tag=132878796-1040067870294
Call-ID: 0010-0016-D69A7DA8-1@192.168.13.2
CSeq:2 INFO
Content-Type: application/broadsoft
Content-Length: 17
event flashhook
FXO Device Interworking SIP E911 Calls from Service Provider's
IP Network to PSAP DID Lines
The device's FXO interface can interwork SIP emergency E911 calls from the Service Provider's
IP network to the analog PSAP DID lines. The standards that define this interface include TR-TSY-
000350 or Bellcore’s GR-350-Jun2003. This protocol defines signaling between the E911 tandem
switch (E911 Selective Router) and the PSAP, using analog loop-start lines. The FXO device can
be implemented instead of an E911 switch, by connecting directly to the PSAP DID loop-start
lines.
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